Deformable Swing Arm Cab Assembly Impact Damping
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Solution Overview
Problem
Heavy commercial vehicle cabs face significant deformation and risk to the driver's living space during frontal crashes due to the rigid behavior of the chassis, which fails to effectively dissipate crash energy, leading to potential harm to the driver.
Innovation Solution
A cab assembly with a deformable swing arm featuring a damping slot that narrows from one side to the other, allowing the connecting element to deform and absorb impact energy by moving through the slot, reducing the force transferred to the cab and chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid chassis is used to maintain structural stability, then the chassis can withstand crash forces, but the cab is subjected to more deformation and the driver's living space is compromised
Solution Approach 1:
The swing arm's structural parameters are changed by introducing a damping slot with varying cross-section, transforming it from a uniform rigid structure to one with controlled deformation zones. This allows the swing arm to change its effective stiffness during impact, absorbing energy while protecting the cab.
Solution Approach 2:
The swing arm acts as an intermediary energy-absorbing component between the chassis and the cab. It includes the impact force and dissipates energy through deformation in the damping slot, preventing direct transmission of full crash forces to the cab structure.
2Object-affected harmful factors
If a deformable chassis is used to reduce cab deformation, then the driver's living space is protected, but the chassis may not withstand high crash forces
Solution Approach 1:
The swing arm is segmented into different functional zones: a stronger upper portion near the chassis connection and a weakened damping slot portion. This segmentation allows different parts to serve different functions - the upper part maintains structural integrity while the slot portion absorbs energy through controlled deformation.
Solution Approach 2:
The damping slot is pre-designed with a specific geometry that anticipates the impact force. The narrowing cross-section is positioned to engage during crash, providing beforehand cushioning that activates only when needed, allowing the chassis to remain strong in normal operation while protecting the cab during impact.
3Ease of manufacture
If a uniform cross-section swing arm is used, then the structure is simple to manufacture, but it cannot effectively dampen impact energy
Solution Approach 1:
The swing arm transitions from uniform quality to non-uniform local quality. The damping slot creates a localized region with reduced cross-section and modified material properties, concentrating deformation in this specific area while leaving the rest of the swing arm structurally sound and relatively simple to manufacture.
4Loss of energy
If a narrowing damping slot is used to increase energy damping, then the swing arm can absorb more impact energy, but the manufacturing precision requirements increase
Solution Approach 1:
The damping slot geometry is designed to be dynamic in function rather than static in form. The narrowing cross-section is optimized to engage progressively during impact, with the deformation behavior being dynamic and adaptive to the force applied, rather than requiring extremely precise static dimensional control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The deformable swing arm with a narrowing damping slot effectively reduces cab deformation and attenuates impact forces, enhancing driver safety by dissipating energy and minimizing the risk of injury during crashes.
Implementation Method 1
A deformable swing arm (4) featuring a damping slot that narrows from one side to the other, allowing the connecting element to deform and absorb impact energy by moving through the slot
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The present invention relates to a cab assembly (1) which is used in driver's cabs of heavy commercial vehicles and which provides damping of a portion of the energy generated when the driver's cab is subjected to an impact.